package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.kafka连接配置信息
        Properties properties = new Properties();
        //连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9092");

        //key 和 value的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");

        //消息组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group1");

        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,false);

        //2.创建消费者对象
        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
        kafkaConsumer.subscribe(Collections.singletonList("itcast-topic-out"));

        //4.拉取消息
        //同步提交和异步提交偏移量
        try {
            while (true){
                ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.offset());
                    System.out.println(consumerRecord.partition());
                }
                //异步提交偏移量
                kafkaConsumer.commitAsync();
            }
        } catch (Exception e){
            e.printStackTrace();
            System.out.println("记录错误的偏移量"+e);
        }finally {
            //同步提交偏移量
            kafkaConsumer.commitSync();
        }


    }
}
